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{ "id": 2220685, "url": "http://patchwork.ozlabs.org/api/1.1/covers/2220685/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260407050818.2249570-1-lulu@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260407050818.2249570-1-lulu@redhat.com>", "date": "2026-04-07T05:05:47", "name": "[RFC,v4,0/5] net/filter: Add AF_PACKET support for vhost-net", "submitter": { "id": 78960, "url": "http://patchwork.ozlabs.org/api/1.1/people/78960/?format=api", "name": "Cindy Lu", "email": "lulu@redhat.com" }, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260407050818.2249570-1-lulu@redhat.com/mbox/", "series": [ { "id": 499026, "url": "http://patchwork.ozlabs.org/api/1.1/series/499026/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499026", "date": "2026-04-07T05:05:51", "name": "net/filter: Add AF_PACKET support for vhost-net", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/499026/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2220685/comments/", "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=Ajz7vD+h;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fqxCn2YXHz1xtJ\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 08 Apr 2026 05:32:05 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wABXZ-0000Gs-FK; Tue, 07 Apr 2026 14:52:45 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <lulu@redhat.com>) id 1wABUI-0004Gu-FY\n for qemu-devel@nongnu.org; Tue, 07 Apr 2026 14:49:22 -0400", "from us-smtp-delivery-124.mimecast.com ([170.10.133.124])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <lulu@redhat.com>) id 1w9yfx-0003Gm-D4\n for qemu-devel@nongnu.org; Tue, 07 Apr 2026 01:08:35 -0400", "from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com\n (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by\n relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3,\n cipher=TLS_AES_256_GCM_SHA384) id us-mta-230-fhvUPWEfNa-74KkjgOTvCA-1; Tue,\n 07 Apr 2026 01:08:27 -0400", "from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com\n (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n (No client certificate requested)\n by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS\n id C70FF180047F; Tue, 7 Apr 2026 05:08:25 +0000 (UTC)", "from S2.redhat.com (unknown [10.72.112.55])\n by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP\n id 5ACEF180058C; Tue, 7 Apr 2026 05:08:22 +0000 (UTC)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1775538510;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n bh=r7MgCxBodV/6hEOvHxo+i0I4wG7WCx8i1dakiz9yVNw=;\n b=Ajz7vD+hoL33pf/whrxVOT50aVAVTFck3X4UvonQjfw5UADLa6CgxqoP9tgSmpqbGQG4Pb\n 47JcFRoiTQXoXUPbkVk4DtKL3ZEfES3dVRcP/u8TMewavTdYLdBvOByyqWKxo3Exo3eZ54\n n51a8fZaMOGhk7NynoJY3+kOaY7I0YE=", "X-MC-Unique": "fhvUPWEfNa-74KkjgOTvCA-1", "X-Mimecast-MFC-AGG-ID": "fhvUPWEfNa-74KkjgOTvCA_1775538506", "From": "Cindy Lu <lulu@redhat.com>", "To": "lulu@redhat.com, mst@redhat.com, jasowang@redhat.com, zhangckid@gmail.com,\n lizhijian@fujitsu.com, jmarcin@redhat.com, qemu-devel@nongnu.org", "Subject": "[RFC v4 0/5] net/filter: Add AF_PACKET support for vhost-net", "Date": "Tue, 7 Apr 2026 13:05:47 +0800", "Message-ID": "<20260407050818.2249570-1-lulu@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.111", "Received-SPF": "pass client-ip=170.10.133.124; envelope-from=lulu@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "X-Spam_score_int": "-25", "X-Spam_score": "-2.6", "X-Spam_bar": "--", "X-Spam_report": "(-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Hi, All\n\nThis series wires AF_PACKET-backed packet capture and inject support into\nthe existing socket chardev backend so filter-redirector can keep using exist\nprocess\n\nExample Usage\n=============\n Users are expected to create the AF_PACKET socket in userspace, bind it\n to the target tap device, and then pass the resulting fd to QEMU via\n the existing FD_PLACEHOLDER mechanism.\n\n Creating such a socket requires CAP_NET_RAW (or running as root). A\n typical setup looks like:\n\n sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW,\n socket.htons(ETH_P_ALL))\n sock.bind((ifname, ETH_P_ALL))\n\n The bound fd can then be passed to QEMU with:\n\n -chardev socket,...,fd=${FD_PLACEHOLDER},...\n\nPrimary VM (mirror incoming packets to secondary via chardev socket):\n\n -netdev \"tap,id=net0,ifname=${TAP}...vhost=on\"\n -device \"${VIRTIO_NET_DEVICE}\"\n -chardev \"socket,id=chain_out,fd=${FD_PLACEHOLDER},af-packet-mode=capture\"\n -chardev \"socket,id=mirror0,host=${MIRROR_HOST},port=${MIRROR_PORT},reconnect-ms=${MIRROR_RECONNECT_MS}\"\n -object \"filter-redirector,id=r1,netdev=net0,queue=tx,indev=chain_out,status=on,vnet_hdr_support=off,position=head\"\n -object \"filter-redirector,id=r1_mirror,netdev=net0,queue=tx,outdev=mirror0,status=on,vnet_hdr_support=off,insert=behind\"\n\nSecondary VM (receive mirrored packets):\n\n -netdev \"tap,id=net0,ifname=${TAP}...vhost=on\"\n -device \"${VIRTIO_NET_DEVICE}\"\n -chardev \"socket,id=red0,host=${MIRROR_BIND_HOST},port=${MIRROR_PORT},server=on,wait=off\"\n -chardev \"socket,id=chain_in,fd=${FD_PLACEHOLDER},af-packet-mode=inject\"\n -object \"filter-redirector,id=r1,netdev=net0,queue=tx,indev=red0,status=off,vnet_hdr_support=off,position=head\"\n -object \"filter-redirector,id=r1_inject,netdev=net0,queue=tx,outdev=chain_in,status=off,vnet_hdr_support=off,position=id=r1,insert=behind\"\n\n\nchangset\n===========\nchange in v2: \n1. add support for filter-buffer \n2. remove the in_netdev and out_netdev for AF_PACKET bind port, now only use netdev \nwhen the vhost=on start use AF_PACKET to capture and inject, when use vhost=off will use\nthe existing code\n3. add CAP_NET_RAW check\n4. address the comment \n\nchange in v3: \n1. reuse the exist Capture/inject process \n\nchange in v4: \n1.move the capture/inject to chardev \n2.move the create/bind socket to user script\n\nTesting\n=======\n- Tested with vhost=on/off TAP device on x86_64\n\n\n\nCindy Lu (5):\n net/filter: allow filters on vhost netdevs\n chardev/socket: add AF_PACKET initialization\n io/channel-socket: tolerate AF_PACKET getpeername\n chardev/socket: add AF_PACKET inject path\n chardev/socket: add AF_PACKET capture path\n\n chardev/char-socket.c | 385 +++++++++++++++++++++++++++++++++-\n chardev/char.c | 3 +\n include/chardev/char-socket.h | 13 ++\n io/channel-socket.c | 6 +-\n net/filter.c | 6 -\n qapi/char.json | 23 +-\n qemu-options.hx | 5 +-\n 7 files changed, 429 insertions(+), 12 deletions(-)" }